*{
    margin: 0;
    padding: 0;
    border: 0;
}
.beijing{
    height: 725px;
    width: 100%;
    overflow: hidden;
    background: url("../img/宇宙.jpg")no-repeat;
    background-size: 100% 100%;
    overflow: hidden;
}
.neirong{
    margin-top: 80px;
    margin-left: 20%;
    height: 80%;
    width: 60%;
    background: url("../img/HUAWEIbackground.png")no-repeat;
    background-size: 100% 100%;
    overflow: hidden;
}
.wjmm{
    height: 70%;
    width: 70%;
    background-color: white;
    opacity: 0.8;
    margin: 0 auto;
    margin-top: 50px;
    border-radius: 18px;
    overflow: hidden;
}
.zhzh{
    border-radius: 18px;
    height: 45px;
    width: 70%;
    margin: 0 auto;
    text-align: center;
    display: block;
    background-color: gray;
    font-size: 25px;
    opacity: 0.8;
}